If you go into Device Manager, you should see whether you have any SCSI devices installed.
There is no difference in 40 or 80 strand cables as far as connection is concerned. The extra 40 strands on an 80 strand cable, are there to eliminate any cross track data leakage using the newer, faster devices. So, an 80 strand cable can be fitted to any computer. It maybe that's all there was available at the time!